9(10d+7)-3=690

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Solution for 9(10d+7)-3=690 equation: 



9(10d+7)-3=690

We move all terms to the left:

9(10d+7)-3-(690)=0

We add all the numbers together, and all the variables

9(10d+7)-693=0

We multiply parentheses

90d+63-693=0

We add all the numbers together, and all the variables

90d-630=0

We move all terms containing d to the left, all other terms to the right

90d=630

d=630/90

d=7

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